单项选择题

Questions 9 and 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each of the two questions. Now listen to the news. According to the new research, the odd shape mounds were formed by______.

A．chemical events
B．geographical events
C．microbes
D．stromatolites

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单项选择题

单项选择题

Questions 9 and 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each of the two questions. Now listen to the news. According to the new research, the odd shape mounds were formed by______. 您的浏览器不支持 audio 元素。